I’m having structs in the arrays. But I’m pretty sure it is a problem of the editor and not the engine. All arrays work as intended when I run the project. I just can’t edit or create new array elements in the editor. So there is still hope ;).
I had one array that threw an error message out. So I investigated and it turned out it contained 82 elements while I entered only 2. There was no loop or anything so I added a ‘clear’ at the start of the node network before adding elements. Then it worked fine. The 80 ghost array elements disappeared. Something weird is going on in the editor only.